Nayax · Ukraine
Skills: C#/.NET, Kotlin, Swift, SQL, AWS, Docker, CI/CD, Accessibility
Description
This position is strictly open to candidates located in Ukraine.
Nayax(https://himalayas.app/companies/nayax) is looking for a Senior Fullstack Developer (.NET + Flutter) to implement changes in the existing backend and continue the rebuild of the mobile app in Flutter. You will work across the server and mobile sides, from REST APIs to releases in the App Store and Google Play.
This role is a good fit if you can drive tasks independently across the whole stack, care about code quality, and are confident working with payment flows.
About the project
Monyx Wallet (product page) is Nayax(https://himalayas.app/companies/nayax)'s mobile wallet for automated businesses: vending machines, laundromats, car washes and other self-service devices. Users pick a device by number or address, or scan a QR code, and pay from their phone. The app supports prepaid cards for closed-loop systems, promotions and loyalty programs, automatic refunds, branded cards, and an SDK for integration into operators' apps.
Where the project is now. A significant part of Monyx has already been rewritten in Flutter as a standalone plugin with its own repositories. Next, a new standalone Monyx app will be built on top of it in Flutter. Some of the logic still needs to be covered, and the payment and automatic refund flows need further work.
What you will do
Backend (.NET)
Implement changes, new features and bug fixes in the existing backend (C, .NET / ASP.NET Core). Design, extend and document REST APIs for the mobile app (Swagger / OpenAPI). Work with relational databases: schemas, efficient queries, migrations. Refactor legacy code and improve the performance, reliability and maintainability of services. Implement authentication and authorization and handle sensitive and payment data securely. Write unit and integration tests and take part in code reviews. Support releases, investigate production incidents and perform root cause analysis.
Mobile (Flutter)
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